When it's attached via USB, it would use the local disk provider--which I believe is a separate format from the FTP provider. I'm not sure if there is a way to do a quick conversion between the two. If you can share your drive from the router as a network drive instead of an FTP, both of those could use the local disk provider. I haven't seen Christopher on the forums lately, but if you submit a ticket he can let you know if there is an easier way to convert the data without just creating a new local disk drive and copying it over.
